Here are a few examples that leap to mind:

 

Ford, you're turning into a penguin. Stop it!

- Arthur Dent, The Hitchhiker's Guide to the Galaxy

 

Penguin cameo in Monty Python's Flying Circus

 

You know, my son, for the first time in my life I have a real fatherly feeling about you. People may say I'm stark-raving mad and say the word "penguin" after each sentence, but I believe that we two can make Britain great... you as the Prince Regent and I as King Penguin!!

- King George III, Blackadder the Third - "Dual and Duality"

 

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